Regenerative principles

Specific Heat. In some appHcations refractories are used for heat-exchange purposes on the regenerative principle, for instance, in blast-furnace stoves. High heat capacity is requited in such appHcations (Table 8). 

The open hearth furnace uses the Siemens regenerative principle to raise maximum combustion temperatures to about 1,650°C and possesses a heating capability independent of the heat content or impurity burning reactions of the iron charge. These features enable the charge placed in the furnace to be any ratio of scrap to hot metal up to 100% scrap, since the furnace can melt this. Usual practice, however, is to use a roughly 50 50 mix of scrap to melt [17]. 

Open>hearth Furnace. A large rectangular furnace in which steel, covered with a layer of slag, is refined on a refractory hearth it is heated by gas or oil, and operates on the regenerative principle which was first applied to this type of furnace by Sir Wm. Siemens in 1867 (hence the earlier name siemens furnace). The type of refractory lining depends on the particular steelmaking process used see acid open-hearth FURNACE, basic OPEN-HEARTH FURNACE and all-basic FURNACE. The process is now obsolete. 

Mechanical Impulse The principle of mechanical impulse when applied to fluids is usually combined with one of the other means of imparting motion. As mentioned earher, this is the case in axial-flow compressors and pumps. The turbine or regenerative-type pump is another device which functions partially oy mechanical impulse. 

Gardner RL (2007) Stem cells and regenerative medicine principles, prospects and problems. C RBiol 330 465 173. 

Catalysts have been bonded to insoluble polymers to allow, in principle, an appreciable simplification of PTC the catalyst represents a third insoluble phase which can be easily recovered at the end of the reaction by filtration, thus avoiding tedious processes of distillation, chromatographic separation and so on. This is of potential interest mainly from the industrial point of view, due to the possibility of carrying on both discontinuous processes with a dispersed catalyst and continuous processes with the catalyst on a fixed bed. This technique was named "triphase catalysis" by Regen (13,33,34). 

All religions have honored the beggar. For he proves that in a matter at the same time as prosaic and holy, banal and regenerative as the giving of alms, intellect and morality, consistency and principles are miserably inadequate. 

Regenerative reactors, that is to say, those exploiting heat storage on fixed beds, remain a somewhat neglected option in reaction engineering. Although the principle of heat regeneration had been utilized previously in the chemical industry,... 

Dye-sensitized solar cell — Dye cells are regenerative dye-sensitized photoelectrochemical cells. Its working principle for energy conversion is based upon photon absorption by a sensitizer with subsequent electron transfer from a photoexcited state of the sensitizer into the - conduction band of a - semiconductor, and from the semiconductor to external circuitry. A charge mediator, a suitable - redox couple is added to the cell - electrolyte for re-reducing the oxidized dye. The mediator is... 

The maternal capacities that provide a homeostatic environment and metabolic deactivation of potential toxicants, along with the repair and regenerative capabilities of the embryo/fetus, are believed to impart a threshold phenomenon to developmental toxicity. The supposition of a threshold implies that a maternal dose exists at which a toxicant will elicit no adverse effect on the conceptus. This is in contrast to the threshold principle of carcinogenesis, which assumes that exposure to any amount of carcinogen, even a single molecule, can potentially lead to cancer. 

In principle, photoelectrochemical cells can be used for the conversion of solar energy into electrical energy or for the production of a storable fuel. The first type (regenerative cells) consists of a semiconductor and inert counter electrode and a redox system in the electrolyte. The current-voltage behaviour is described by the diode equation, which is also valid for pure solid state devices (pn-junction, Schottky diode) i.e. 

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